SSI.php in Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, does not properly restrict guest access, which allows remote attackers to have an unspecified impact via unknown vectors.

The loadUserSettings function in Load.php in Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, does not properly handle invalid login attempts, which might make it easier for remote attackers to obtain access or cause a denial of service via a brute-force attack.

Cross-site scripting (XSS) vulnerability in the EditNews function in ManageNews.php in Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, might allow remote authenticated users to inject arbitrary web script or HTML via a save_items action.

Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, does not properly validate the start parameter, which might allow remote attackers to conduct SQL injection attacks, obtain sensitive information, or cause a denial of service via a crafted value, related to the cleanRequest function in QueryString.php and the constructPageIndex function in Subs.php.

The PlushSearch2 function in Search.php in Simple Machines Forum (SMF) before 1.1.13, and 2.x before 2.0 RC5, uses certain cached data in a situation where a temporary table has been created, even though this cached data is intended only for situations where a temporary table has not been created, which might allow remote attackers to obtain sensitive information via a search.

Multiple SQL injection vulnerabilities in Simple Machines Forum (SMF) before 1.1.15 and 2.x before 2.0.1 allow remote attackers to execute arbitrary SQL commands via vectors involving a (1) HTML entity or (2) display name. NOTE: some of these details are obtained from third party information.

Cross-site request forgery (CSRF) vulnerability in Simple Machines Forum (SMF) 2.x before 2.0.1 allows remote attackers to hijack the authentication of administrators or moderators via vectors involving image files, a different vulnerability than CVE-2011-3615. NOTE: some of these details are obtained from third party information.

File Disclosure in SMF (SimpleMachines Forum) <= 2.0.3: Forum admin can read files such as the database config.

Simple Machines Forum (SMF) through 2.0.5 has XSS

Unrestricted file upload vulnerability in the avatar upload functionality in Simple Machines Forum before 2.0.6 and 2.1 allows remote authenticated users to execute arbitrary code by uploading a file with an executable extension, then accessing it via a direct request to the file in an unspecified directory.

Simple Machines Forum (SMF) before 1.1.19 and 2.x before 2.0.6 allows remote attackers to conduct clickjacking attacks via an X-Frame-Options header.

Simple Machines Forum (SMF) before 1.1.19 and 2.x before 2.0.6 allows remote attackers to impersonate arbitrary users via multiple space characters characters.

Simple Machines Forum (SMF) 2.0.6, 1.1.19, and earlier allows remote attackers to impersonate arbitrary users via a Unicode homoglyph character in a username.

Simple Machines Forum (SMF) 2.0.4 allows local file inclusion, with resultant remote code execution, in install.php via ../ directory traversal in the db_type parameter if install.php remains present after installation.

Simple Machines Forum (SMF) 2.0.4 allows XSS via the index.php?action=pm;sa=settings;save sa parameter.

Simple Machines Forum (SMF) 2.0.4 allows PHP Code Injection via the index.php?action=admin;area=languages;sa=editlang dictionary parameter.

Packages.php in Simple Machines Forum (SMF) 2.1 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via the themechanges array parameter.

LogInOut.php in Simple Machines Forum (SMF) 2.1 allows remote attackers to conduct PHP object injection attacks and execute arbitrary PHP code via vectors related to variables derived from user input in a foreach loop.

The MessageSearch2 function in PersonalMessage.php in Simple Machines Forum (SMF) before 2.0.15 does not properly use the possible_users variable in a query, which might allow attackers to bypass intended access restrictions.

An issue was discovered in Simple Machines Forum (SMF) before release 2.0.17. There is SSRF related to Subs-Package.php and Subs.php because user-supplied data is used directly in curl calls.

An issue was discovered in Simple Machines Forum (SMF) before 2.0.16. Reverse tabnabbing can occur because of use of _blank for external links.

SimpleMachinesForum 2.1.1 and earlier allows remote authenticated administrators to execute arbitrary code by inserting a vulnerable php code because the themes can be modified by an administrator. NOTE: the vendor's position is that administrators are intended to have the ability to modify themes, and can thus choose any PHP code that they wish to have executed on the server.

A vulnerability was found in SimpleMachines SMF 2.1.4 and classified as problematic. Affected by this issue is some unknown functionality of the file ManageAttachments.php. The manipulation of the argument Notice leads to cross site scripting. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure.

A vulnerability was found in SimpleMachines SMF 2.1.4. It has been classified as problematic. This affects an unknown part of the file ManageNews.php. The manipulation of the argument subject/message leads to cross site scripting. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure.

A stored cross-site scripting (XSS) vulnerability in Simple Machines Forum v2.1.6 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Forum Name parameter.